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Asynchronous READs

OSR_Community_UserOSR_Community_User Member Posts: 110,217
Hello All,

I am writing a client driver for the standard serial driver for
winnt.

My driver is properly working with synchronous reads and write calls with
timeouts.

The problem comes with the asynchronous read call .

I am using separate threads for issung IRP_MJ_READ IRPs and then continually
making a byte requests , but the driver is gettng crashed at shutdown . One
reason that i think is one IRP is always outstanding.


Rakesh Shrivastava
Communications
DCM Tech
New Delhi

Comments

  • OSR_Community_UserOSR_Community_User Member Posts: 110,217
    If you are shutting down the system after some time of "no activity" on part
    of your driver, chances are that all the IRPs are getting completed. There
    could be some other problem. On the other hand, if the system crashes after
    some activity of your driver, here is what I would do:

    1. Create a linked list of all IRPs coming to my driver, deleting them from
    the list as they get completed. So finally I have a list of not-yet-complete
    IRPs.

    2. Assign Cancle routines to the IRPs, and at shutdown, cancle any such
    outstanding IRPs.

    Hope that helps,
    Shweta.

    Hello All,

    I am writing a client driver for the standard serial driver for
    winnt.
    My driver is properly working with synchronous reads and write calls with
    timeouts.

    The problem comes with the asynchronous read call .

    I am using separate threads for issung IRP_MJ_READ IRPs and then continually
    making a byte requests , but the driver is gettng crashed at shutdown . One
    reason that i think is one IRP is always outstanding.



    Rakesh Shrivastava
    Communications
    DCM Tech
    New Delhi

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